Fig. 8.11 6 The odge of an alumintum cube is 10 cm long. One face of the cube is firmly fixed to a vertical wall. A mass of 100 kg is then attached to the opposite face of the cube. The shear modulus of alumintum is 25 GPa . What is the vertical deflection of this face? 7 Four identical hollow cylindrical columns of mild steel support a big structure of mass